In rare cases, some may continue to grow into their early twenties. At age 16, you can drive a car. At 18, you’re legally an adult in most states. At 21, you can legally buy alcohol. But at what age do you stop growing taller? Even if you hit puberty late, you’re unlikely to grow significantly after the ages of 18 to 20. Most boys reach their peak height around the age of 16. However, Check This product out men still develop in other ways well into their twenties. In this article, Prime Boosts we’re going to discuss when guys typically stop growing and factors that determine how tall you’ll be. In this article, we talk about how long people assigned male at birth keep growing. It’s important to note that not everyone assigned male at birth identifies with the label "man" or "guy" or "boy." However, at times we use these terms to reflect the language in a study or statistic.